If you need to use one of the newer 1100 fore ends, that does not have the detent pin, with an older 1100; the simplest solution is to use a wave/spring washer between the magazine cap and fore end.
Michael Goines
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>New Page 1</title>
</head>
<body>
</body>
</html>